Safety fuse plug and receptacle therefor



Jan. ("7, 1930. E. DE BRUIJN 1,743,015

SAFETY FUSE PLUG AND RECEPTACLE THEREFOR F'iled April 13. 1928 2Sheets-Sheet l Y I Z ,3 52 3, 4 INVENTOR a wnNr-:ssEs 46 v Emu cZeBmL nw M @m4/143%' l ATTORNEY Jan. 7, 1930. E. DE BRUIJN 1,743,016

SAFETY FUSE PLUG AND RECEPTACLE THEREFOR Filed April 15, 1928 2sheets-sheet 2 INVENTOR WITNEssEs Emu deBmbi/ 'n/ 'ATTORNEY PatentedJan. 7, 1930 PATENT GFFICE EMIL DE BRUIJN, F ROSLYN, PENNSYLVANIA SAFETYFUSE PLUG AND Application filed April 13,

This invention relates to safety appurtenances or devices used inconnection with electrical circuits.

One ot theimportant objects ot' the invention is the provision of safetymeans to prevent an electrical installation of known potential andamperage, from being impaired or blown out by the use ot' diversimproper substitutes for fuses.

Another obj ect of the invention is the provision of a fuse plugreceptacle embodying improved features of construction to obtain theabove mentioned result.

Another object of the invention is to provide an improved form ofelectrical fuse and plug.

Another object ofthe invention is to provide novel means for assemblingthe electrical and insulator appurtenances of a fuse plug receptacle.

The nature of the invention and its distinguishing features andadvantages will appear when the following specilication is read inconnection with the accompanying drawing, in which- Figure 1 is anelevation of the :fuse plug receptacle, and fuse plug in place.

Fig. 2 is a sectional view taken on the line 2-2 of Fig. 1.

Fig. 3 is a sectional view taken on the line 3-3 of Fig. 1, showing thefuse plug before being turned.

Fig. 4 is a sectional view through the fuse plug.

Fig. 5 is an elevation of one section ot the fuse plug receptacle.

Fig. 6 is an elevation of the other section ot' the fuse plugreceptacle.

Fig. 7 is a view similar to Fig. 6, but showing the fuse plug in place;the fuse terminals being shown in circuit closing positions.

Fig. 8 is a sectional v-iew through the .fuse plug receptacle, thesection being indicated by the line 8-8 of Fig. 7.

Fig. 9 is a perspective view of the guard member of the receptacle.

Fig. 10 is a sectional view taken on the line 10-10 ot Fig. 9.

Fig. 11 is a perspective view of the other guard member of thereceptacle.

RECEPTACLE THEREFOR 1928. Serial No. 269,777.

In accordance with one feature ot the present invention, use is made ofa special type of fuse plug receptacle 10. The said receptacle 10includes base members 11 and 12 of suitable insulating material such asfiber 0r porcelain, or any other preferred material. The base member 11has a recess which accommodates a bridge member 13 of conductingmaterial, held in place by screws 14 respectively received in threadedsockets 15 embedded in the base member 11. The base member 11 also has arecess which accommodates members 16 ot conducting material each havinga spring contact 17. Each member 16 is held in place by a screw 18received in a threaded socket 19 embedded in the base member 11. rlhebase member 11 has a recess at each end in order to provide an openingfor the reception of the end of a flexible cable indicated at 20 whichprotects the insulated 7 electrical conductors 21, the terminals ofwhich are respectively connected with the screws'li and 18.

The base member 12 is provided with a recess which accommodates a guardmember 22 of conducting material. The guard member 22 is in the form ofa flanged disk and has openings 23, and burrs 2/1 for a purpose toappear. The base member 12 also has a recess which accommodates a disk25 having a notch 26 in the peripheral edge thereof, and also a notch 27in the peripheral edge thereof. The disk 25 is turnable on a screw 28received in a threaded socket 29 embedded in the base member 12. Thebase member 12 also has a recess which accommodates a spring 30, one endof which is disposed in the notch 27 in the disk 25. A guard member 31of conducting material is held in place on the base member 12 by a screw32 received in a threaded socket 33 embedded in the base member 12. Themember 31 has a key slot 3A of any preferred shape. A portion of themember 31 is in contact with the member 22 as at 35, and said member 31has a spring contact 36 which is engageable with the bridge member 13when the base members 11 and 12 are brought together. The base member 12has a socket 37 in axial alignment with the guard member 22 The socket37 has arcuate shoulders 38? ico on the wall thereof which presentnotches 39 diametrically opposite each other. The base member 11 isprovided with studs 40 respectively at the corners thereof, and the basemember 12 is provided with holes 41 respectively at the corners thereof,the arrangement of the holes 41 being similar to the arrangement of thestuds 40, such as to insure the proper association of the base member 12with the base member 11.

The side faces 42 and 43 respectively of the base members 11 and 12 beara diverging relationship.

In order to properly support the base inembers 11 and, 12 in associationwith each other in a fixed position on a suitable support or a wall,there is provided a holder 44 of sheet metal or other suitable material.The holder 44 is in the form of an open ended casing or shell having afront wall 45 and rear flanges 46. The front wall 45 has holes 47 forthe accommodation of a screw driver which may be used for driving homescrews, indicated at 48, which extend through the flanges 46, and takeinto the support or wall. The holder 44 is thus held in plac and theflanges 46 and front wall 45 bear a diverging relationship. It will nowbe apparent that the receptacle 10 in its entirety may be positioned inthe holder 44 from the top, and will be held in place by the Walls ofthe holder 44, as shown most clearly in Figs. 2' and The front wall 45has an opening 49 with which the socket 37 registers.

In accordance with another feature of the invention, there is provided anovel form of fuse element 50 and plug 51 which carries the fuse element50. The plug 51 is made of insulating material, preferably glass, and isdesigned to fit in the socket 37. The plug 51 is provided with lugs 52arranged diametrically opposite each other which are re ceivablerespectively in the notches 39, and are engageable under the shoulders38 to hold the plug in place. The fuse element 50 has key terminalsrespectively connected or formed integral with the opposite enesthereof. The key terminals are designated 53, and each will be so formedas to provide a ward appropriated to the slot 34 in the member 31. Theterminals 53 are so disposed as to be received in the openings 23 in theguard member 22, when the plug 51 is being inserted in the socket- 37.When the plug 51 has been pushed fully into the socket 37 it may beturned substantially 900. One of the ter` mina-ls 53 of the fuse elementpasses through the key slot 34, while the other terminal 53 enters thenotch 26 in the disk 25, durin the turning movement of the plug 51. Thedisk 25 is prevented from turning beyond a ccrtain point by engagementof one of the lugs 52 with socket 29 therefore limiting the turningmovement of the plug 51, to' a position in which the terminals 53 of thefuse element 50 Will be in engagement with the contacts 17, therebycompleting the circuit.

It is to be understood that the fuse element 50 will be suitable tocarry the amperage of the circuit in which it is used, and that when thefuse element 51 blows for any reason, it will be necessary to replacethe same by the use of a similar plug and fuse element carried thereby.This precaution is taken to prevent the use of divers impropersubstitutes for fuses. For instance it will prevent the use of lead ortinfoil between the terminals 53 of the plug 51 after the fuse element50 has blown, because it then Will make contact with guard member 22causing a dead short circuit. In case tinfoil or other conductingmaterial, While positioned between the terminals 53, is covered byinsulation tape or the like, the burrs 24 on the guard member 22 willpuncture the same, and will make contact with the tinfoil, creating adead short circuit. Furthermore a short circuit will be caused throughthe bridge member 13, guard member 22 and guard member 31. It will alsobe apparent that the guard member 22 prevents the insertion ofnondescript articles into the receptacle 10 for the purpose of bridgingthe contacts17 It will be apparent that in order to properly reconditionthe circuit, a fuse plug and -fuse element of a certain type asdescribed will have to be used, thus providing a safeguard againstimpairing an electrical installation, and from blowing out main fuses,and otherwise short circuiting the installation.

l claim:

1. As a new article of manufacture, an insulator plug, an electricalfuse element carried by said plug, said fuse element eX- tending withinsaid plug having terminal means in the form of keys projecting from theplug, and adapted to be passed through irregular holes or openings in anelectrical receptacle, to make an electrical connection with thecontacts thereof.

2. As a new article of manufacture, an insulator base, spaced electricalcontacts arranged in a recess in one face of the base, and a guardmember positioned on the base with relation to the contacts, said guardmember having irregular shaped openings therein, through which thedeterminate ,shaped terminals respectively of an electrical fuse elementmay be passed.

3. A device having electrical contacts, a socket, a guard memberhavingopenings therein positioned in said socket with respectto saidcontacts, and a second guard member having an irregular' shaped notchtherein positioned with respect to said contacts, and in combination, aplug having a fuse element, said fuse element having terminalsprojecting from said plug, said plug being receivable in said socket,each of said terminals trical plug may be inserted in said socket havinga key ward corresponding to the shape ot said notch, so that when theplug is being inserted into said socket, the terminals respectively,will pass through the openings in the first guard member, and so thatwhen the plug, while in the socket, is being turned, one of saidterminals will pass through the notch in the second guard member, sothat both terminals respectively will be engageable with said contacts.

4. A fuse plug receptacle comprising an insulator base, a bridge memberon said base, contacts on said base, a guard member on said base inguarding position with respect to said contacts, and a second guardmember on said base in electrical engagement with said bridge member andiirst guard member, and also in guarding position with respect to one ofsaid contacts.

5. The combination with a fuse plug receptacle having a socket, contactssecured to said receptacle and disposed in a recess therein adjacentsaid socket, and guard means interposed with respect to the socket andcontacts; ot a fuse plug adapted to be inserted into the socket, a fuseelement on said plug having terminals each of definite shape to clearsaid guard means, to be brought into enthrough said opening.

Signed at New York, in the county of New York and State of New York,this 11th day ot April, A. D. 1928.

. EMIL DE BRUIJN.

gagement with said contacts, in the insertion of the plug in saidsocket.

6. In combination an insulator base having contacts disposed in a recesstherein, and a socket juxtaposed with respect to said contacts; a membersecured to said base and having a guard portion which projects into saidrecess adjacent one of said contacts; a plug adapted to be inserted intosaid socket, said plug being made of insulating material and having aconducting element with terminals projecting from the plug, and saidplug adapted to be turned while disposed in the socket to bring theterminals into engagement with the contacts to bridge the same, each otsaid terminals being of deinite shape to clear said guard portion.

7. The combination oi an electrical receptacle adapted to accommodate anelectrical plug, an open ended holder adapted to be attached to asuitable support, said receptacle and holder having complemental shapesto permit the receptacle to be inserted into the holder from one end, tobe held in place by the walls of the holder.

8. The combination of a sectional electrical receptacle having a plugsocket, an open ended holder adapted to be attached to a suitablesupport, said receptacle and holder having complemental shapes to permitthe receptacle to be inserted into the holder from one end to be held inplace by the walls of the holder, said holder having an opening in onewall which registers with said socket when the receptacle is in theholder so that an elec-

